858109423 has 2 divisors, whose sum is σ = 858109424. Its totient is φ = 858109422.

The previous prime is 858109319. The next prime is 858109429. The reversal of 858109423 is 324901858.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-858109423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (858109429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429054711 + 429054712.

It is an arithmetic number, because the mean of its divisors is an integer number (429054712).

Almost surely, 2^858109423 is an apocalyptic number.

858109423 is a deficient number, since it is larger than the sum of its proper divisors (1).

858109423 is an equidigital number, since it uses as much as digits as its factorization.

858109423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 858109423 is about 29293.5047920183. The cubic root of 858109423 is about 950.2711776173.

The spelling of 858109423 in words is "eight hundred fifty-eight million, one hundred nine thousand, four hundred twenty-three".